MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Channels display multi-path due to |
| A. | Scattering |
| B. | Time delayed reflections |
| C. | Diffraction |
| D. | All of the mentioned |
| Answer» E. | |
| 2. |
The channel may be affected by |
| A. | Thermal noise |
| B. | Interference from other signals |
| C. | Thermal noise & Interference from other signals |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
The average noise power of white noise is |
| A. | 0 |
| B. | Infinity |
| C. | 1 |
| D. | None of the mentioned |
| Answer» C. 1 | |
| 4. |
The sample from the demodulation process consists of sample which is _______ to energy of the received symbol and _____ to noise. |
| A. | Directly and inversely proportional |
| B. | Inversely and directly proportional |
| C. | Both directly proportional |
| D. | Both inversely proportional |
| Answer» B. Inversely and directly proportional | |
| 5. |
THE_AVERAGE_NOISE_POWER_OF_WHITE_NOISE_IS?$ |
| A. | 0 |
| B. | Infinity |
| C. | 1 |
| D. | None of the mentioned |
| Answer» C. 1 | |
| 6. |
Channels display multi-path due to$ |
| A. | Scattering |
| B. | Time delayed reflections |
| C. | Diffraction |
| D. | All of the mentioned |
| Answer» E. | |
| 7. |
The_channel_may_be_affected_by$ |
| A. | Thermal noise |
| B. | Interference from other signals |
| C. | Thermal noise & Interference from other signals |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 8. |
The sample from the demodulation process consists of sample which is _______ to energy of the received symbol and _____ to noise? |
| A. | Directly and inversely proportional |
| B. | Inversely and directly proportional |
| C. | Both directly proportional |
| D. | Both inversely proportional |
| Answer» B. Inversely and directly proportional | |
| 9. |
The composite equalizing filter is the combination of |
| A. | Receiving and equalizing filter |
| B. | Transmitting and equalizing filter |
| C. | Amplifier and equalizing filter |
| D. | None of the mentioned |
| Answer» B. Transmitting and equalizing filter | |
| 10. |
The filter which is used to recover the pulse with less ISI is called as |
| A. | Matched filter |
| B. | Correlator |
| C. | Matched filter & Correlator |
| D. | None of the mentioned |
| Answer» C. Matched filter & Correlator | |
| 11. |
Which are called as hard decisions? |
| A. | Estimates of message symbol with error correcting codes |
| B. | Estimates of message symbol without error correcting codes |
| C. | All of the mentioned |
| D. | None of the mentioned |
| Answer» C. All of the mentioned | |
| 12. |
White noise has _______ power spectral density. |
| A. | Constant |
| B. | Variable |
| C. | Constant & Variable |
| D. | None of the mentioned |
| Answer» B. Variable | |
| 13. |
Thermal noise in the communication system due to thermal electrons |
| A. | Can be eliminated |
| B. | Cannot be eliminated |
| C. | Can be avoided upto some extent |
| D. | None of the mentioned |
| Answer» C. Can be avoided upto some extent | |
| 14. |
The causes for error performance degradation in communication systems are |
| A. | Interference |
| B. | Electrical noise |
| C. | Effect of filtering |
| D. | All of the mentioned |
| Answer» E. | |
| 15. |
The term heterodyning refers to |
| A. | Frequency conversion |
| B. | Frequency mixing |
| C. | Frequency conversion & mixing |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |